How to find detail on the spline implementation

panara · March 31, 2005, 04:37

Dear all,

I need to create a new mesh using splines...

Where I can found the details about the implementation of simpleSpline and polySpline ??

when I use polySpline with the control point that I have I get a segmentation fault.

When I use simpleSpline instead the curve is created but for some reasons even if my interpolation points have x coordinates in the range of my starting and ending point I get a curve with x values outside this range that mess up the grid

Thanks in advance,

Daniele

henry · March 31, 2005, 05:03

The implementation of splines in blockMesh is in OpenFOAM-1.1/applications/utilities/mesh/generation/blockMesh/curvedEdges
Unfortunately they haven't been used much and therfore not well tested. Please let us know if you make any improvements to the implementation and it would also be useful to have a few more interesting test meshes using splines that we can distribute with blockMesh.

mattijs · September 15, 2006, 12:51

Can you please report a bug for this?

Thanks

September 18, 2006, 01:54

Will do

gemaforce · May 2, 2008, 03:22

Can I ask if the polySpline command has been fixed for OpenFOAM 1.4.1 already? I have been trying to plot a polySpline, but I'm still getting segmentation errors. And similar to Olle, if it has been changed to polyLine, it works fine. Is there any way I can draw a smooth curve still?

Thanks
Samuel

mattijs · May 2, 2008, 04:22

The blockMeshDict posted above does not contain the start and end point after the control points. (See blockMesh/curvedEdges/polySplineEdge.C where it reads the controlpoints and then two extra points) I have not used splines so cannot help you with their meaning.

andersking · July 10, 2008, 11:37

Hi,
the two vectors at the end of the points list are the starting and ending gradient of the curve. Also, the code has a bug in it (you will always end up with a straight line) The workaround given in the following thread.

http://www.cfd-online.com/OpenFOAM_D.../126/7880.html

Cheers,
Andrew

wolle1982 · December 3, 2008, 11:47

Hallo,
the workaround is integrated in OF-1.5. But as I see, it still doesn't work right. Please help on that and see the examplecase in
http://www.cfd-online.com/OpenFOAM_D...6574#POST29425

Thanks.

March 31, 2005, 04:37	Dear all, I need to create	#1
panara Senior Member Daniele Panara Join Date: Mar 2009 Posts: 101 Rep Power: 17	Dear all, I need to create a new mesh using splines... Where I can found the details about the implementation of simpleSpline and polySpline ?? when I use polySpline with the control point that I have I get a segmentation fault. When I use simpleSpline instead the curve is created but for some reasons even if my interpolation points have x coordinates in the range of my starting and ending point I get a curve with x values outside this range that mess up the grid Thanks in advance, Daniele

March 31, 2005, 05:03	The implementation of splines	#2
henry Senior Member Join Date: Mar 2009 Posts: 854 Rep Power: 22	The implementation of splines in blockMesh is in OpenFOAM-1.1/applications/utilities/mesh/generation/blockMesh/curvedEdges Unfortunately they haven't been used much and therfore not well tested. Please let us know if you make any improvements to the implementation and it would also be useful to have a few more interesting test meshes using splines that we can distribute with blockMesh.

September 15, 2006, 12:51	Can you please report a bug fo	#3
mattijs Senior Member Mattijs Janssens Join Date: Mar 2009 Posts: 1,419 Rep Power: 26	Can you please report a bug for this? Thanks

September 18, 2006, 01:54	Will do	#4
olle_bodin Guest Posts: n/a	Will do

May 2, 2008, 03:22	Can I ask if the polySpline co	#5
gemaforce New Member Samuel Pang Join Date: Mar 2009 Posts: 15 Rep Power: 17	Can I ask if the polySpline command has been fixed for OpenFOAM 1.4.1 already? I have been trying to plot a polySpline, but I'm still getting segmentation errors. And similar to Olle, if it has been changed to polyLine, it works fine. Is there any way I can draw a smooth curve still? Thanks Samuel

May 2, 2008, 04:22	The blockMeshDict posted above	#6
mattijs Senior Member Mattijs Janssens Join Date: Mar 2009 Posts: 1,419 Rep Power: 26	The blockMeshDict posted above does not contain the start and end point after the control points. (See blockMesh/curvedEdges/polySplineEdge.C where it reads the controlpoints and then two extra points) I have not used splines so cannot help you with their meaning.

July 10, 2008, 11:37	Hi, the two vectors at the e	#7
andersking Member Andrew King Join Date: Mar 2009 Location: Perth, Western Australia, Australia Posts: 82 Rep Power: 17	Hi, the two vectors at the end of the points list are the starting and ending gradient of the curve. Also, the code has a bug in it (you will always end up with a straight line) The workaround given in the following thread. http://www.cfd-online.com/OpenFOAM_D.../126/7880.html Cheers, Andrew __________________ Dr Andrew King Fluid Dynamics Research Group Curtin University

December 3, 2008, 11:47	Hallo, the workaround is inte	#8
wolle1982 Senior Member Wolfgang Heydlauff Join Date: Mar 2009 Location: Germany Posts: 136 Rep Power: 21	Hallo, the workaround is integrated in OF-1.5. But as I see, it still doesn't work right. Please help on that and see the examplecase in http://www.cfd-online.com/OpenFOAM_D...6574#POST29425 Thanks.

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